问题
单项选择题
According to the passage, which of the following offers most of the HDTV programmes so far
A．Retailer delivery services.
B．Cable providers.
C．Commercial television stations.
D．HDTV set manufacturers.
答案
参考答案：C
解析：[分析] 推断题型。 根据第二段第四句Most of the industry's cable providers do not yet offer high-definition programing, and only about 15% of commercial television stations have switched over to even the lowest improved digital pictures．可知答案是C项。